2 68k cpu questions

[Franzi Edo.]

Gentlemen,
I have a couple of problems concerning the cross-compilation.
I have generated a toolchain to create the compiler for 68k targets;  
here are my conditions:
1:   running on OSX 10.4.6
2:   toolchain for 68k-elf cpu created with binutils-2.16.92,  
gcc-4.1.0 and newlib-1.14.0
3:   I have written the functions ...
       ... close, fstat, getpid, isatty, kill, lseek, open, read,  
sbrk, stat, unlink, write, inbyte, outbyte to be able
       to use stdlib functions.

4:   I can create applications but the linker informs me that the  
symbol "__errno" is undefined (see the snapshot of the listing)

0011b6ba g     F .text	00000012 _cleanup
0011ce84 g     F .text	0000008a _Balloc
00000000         *UND*	00000000 __errno
0011cf0e g     F .text	00000104 _d2b
0011d200 g     F .text	00000160 _multiply
0011def4 g     F .text	00000032 _fstat_r

Any suggestion on how to define (or use) this symbol?

My second question is about the access to the static data. I would  
like to point the data with an index register
(typically A5). So, the crt0 should be able to initialise A5 with  
the .data pointer and I would like that gcc generates the
data access like this move.l  .....,(offsetxyz,A5).

Any suggestion on how to implement this?
Thanks
   Edo



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